Gronk (2011): 90 catches, 1327 yards, 14.7 avg, 17TD
Gonzalez (2004): 102 catches, 1258, 12.3 avg, 7 TD
Sharpe (1996): 80 catches, 1062, 13.3, 10 TD
Gonzalez's career and overall production are staggering. Plus he was so ridiculously durable. But if you just look at peak season and unstoppability at the peak of their powers, I'm pretty sure it was Gronk. No one knew what to do with him. He was essentially unstoppable when he was young and healthy.